Jm. Torres et al., Determination of Sr-90 in aquatic organisms by extraction chromatography: method validation, ANALYT CHIM, 414(1-2), 2000, pp. 101-111
A method is presented for the determination of Sr-90 in plankton and cod ma
trices using extraction chromatography. The samples were microwave digested
using closed-pressurised vessels and the Sr-90 was separated by extraction
chromatography using a crown ether sorbed on an inert substrate. The separ
ation yield of Sr ranged from 80 to 100%. Separation reproducibility, resin
capacity and matrix effect were also investigated. The maximum resin capac
ity was 8.76 mg of Sr/g of resin. The same resin could be used more than te
n times without decrease of performance. Except Ba, which eluted together w
ith Sr, none of the elements studied interfered with the separation of Sr s
ince practically all were washed out before the elution step. A method usin
g 8 M HNO3 as washing agent, before the Sr elution with 0.05 M HNO3, is pro
posed to remove Ba completely. The separation method was checked with BCR C
RM 414 Plankton and BCR CRM 422. Cod Muscle spiked with Sr-90. (C) 2000 Els
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